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authorUlrich Drepper <drepper@redhat.com>2000-06-26 01:47:56 +0000
committerUlrich Drepper <drepper@redhat.com>2000-06-26 01:47:56 +0000
commitd82e4c7bb231c9e0f835bd46467563ac3b56cebe (patch)
treea408089f079a086df0ed1602c67612d12fc7ac2a /linuxthreads/spinlock.h
parent7475d01602e881e206a29ee30bc8c3e85c235379 (diff)
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Update.
2000-06-25 Ulrich Drepper <drepper@redhat.com> * Makefile (tests): Add ex10. Add rules to build it. * Versions [GLIBC_2.2] (libpthread): Add pthread_mutex_timedlock, pthread_rwlock_timedrdlock, and pthread_rwlock_timedwrlock. * condvar.c (pthread_cond_wait): Allow mutex of kind PTHREAD_MUTEX_TIMED_NP. (pthread_cond_timedwait_relative): Likewise. * mutex.c (__pthread_mutex_init): Default is PTHREAD_MUTEX_TIMED_NP. (__pthread_mutex_trylock): Use __pthread_alt_trylock for PTHREAD_MUTEX_ERRORCHECK_NP. Handle PTHREAD_MUTEX_TIMED_NP. (__pthread_mutex_lock): Use __pthread_alt_lock for PTHREAD_MUTEX_ERRORCHECK_NP. Handle PTHREAD_MUTEX_TIMED_NP. (__pthread_mutex_timedlock): New function. (__pthread_mutex_unlock): Use __pthread_alt_unlock for PTHREAD_MUTEX_ERRORCHECK_NP. Handle PTHREAD_MUTEX_TIMED_NP. (__pthread_mutexattr_init): Use PTHREAD_MUTEX_TIMED_NP. (__pthread_mutexattr_settype): Allow PTHREAD_MUTEX_TIMED_NP. * spinlock.c: Implement alternate fastlocks. * spinlock.h: Add prototypes. * Examples/ex10.c: New file. * sysdeps/pthread/pthread.h: Add prototypes for new functions. Patch by Kaz Kylheku <kaz@ashi.footprints.net>. * rwlock.c (__pthread_rwlock_rdlock): Optimize loop a bit. (__pthread_rwlock_timedrdlock): New function. (__pthread_rwlock_timedwrlock): New function. Use laternate fastlock function everywhere.
Diffstat (limited to 'linuxthreads/spinlock.h')
-rw-r--r--linuxthreads/spinlock.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h
index d1da3c1094..1145c72636 100644
--- a/linuxthreads/spinlock.h
+++ b/linuxthreads/spinlock.h
@@ -106,7 +106,39 @@ static inline int __pthread_trylock (struct _pthread_fastlock * lock)
return 0;
}
+/* Variation of internal lock used for pthread_mutex_t, supporting
+ timed-out waits. Warning: do not mix these operations with the above ones
+ over the same lock object! */
+
+extern void __pthread_alt_lock(struct _pthread_fastlock * lock,
+ pthread_descr self);
+
+extern int __pthread_alt_timedlock(struct _pthread_fastlock * lock,
+ pthread_descr self, const struct timespec *abstime);
+
+extern void __pthread_alt_unlock(struct _pthread_fastlock *lock);
+
+static inline void __pthread_alt_init_lock(struct _pthread_fastlock * lock)
+{
+ lock->__status = 0;
+ lock->__spinlock = 0;
+}
+
+static inline int __pthread_alt_trylock (struct _pthread_fastlock * lock)
+{
+ long oldstatus;
+
+ do {
+ oldstatus = lock->__status;
+ if (oldstatus != 0) return EBUSY;
+ } while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock));
+ return 0;
+}
+
+/* Initializers for both lock variants */
+
#define LOCK_INITIALIZER {0, 0}
+#define ALT_LOCK_INITIALIZER {0, 0}
/* Operations on pthread_atomic, which is defined in internals.h */